Hi. I've been reading the Query Syntax page at
http://jakarta.apache.org/lucene/docs/queryparsersyntax.html and I'm not
sure I understand the difference between the prohibit operator (-) and the
exclude operator (!).
It seems that NOT is the exclude operator and the short form is !. I quote:
The NOT operator excludes documents that contain the
term after NOT. This is equivalent to a difference
using sets. The symbol ! can be used in place of the
word NOT.
To search for documents that contain "jakarta apache"
but not "jakarta lucene" use the query:
"jakarta apache" NOT "jakarta lucene"
The minus sign (-) is described in its own section as the prohibit operator.
I quote:
The "-" or prohibit operator excludes documents that
contain the term after the "-" symbol.
To search for documents that contain "jakarta apache"
but not "jakarta lucene" use the query:
"jakarta apache" -"jakarta lucene"
My question is: what is the difference between these two operators? If
there is no difference, then why are there two operators?
Thanks,
Jon
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